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Trade and Other Receivables - Summary of Movement in Allowance for Expected Lifetime Credit Losses of Trade and Other Receivables (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Trade and other receivables [abstract]      
At 1 January $ (77) $ (69) $ (56)
Adjustment arising on adoption of IFRS 9 67    
Provided (28) (15) (25)
Amounts written back 0 2 5
Amounts written off 26 6 5
Exchange adjustments 1 (1) 2
At 31 December $ (11) $ (77) $ (69)